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The test for detection of viricidal activity provided in this section shall be conducted when such a test is prescribed in an applicable standard requirement or in the filed Outline of Production for each inactivated liquid biological product used as diluent for a desiccated live virus vaccine in a combination package.

(a) Bulk or final container samples of completed product from each serial shall be tested.

(b) The product shall be tested with each virus fraction for which it is to be used as a diluent. If the vaccine to be rehydrated contains more than one virus fraction, the test shall be conducted with each fraction after neutralization of the other fraction(s), and/or dilution of the vaccine beyond the titer range of the other fraction(s), or the test shall be conducted using representative single-fraction desiccated vaccines which are prepared by the licensee and which are licensed. Provided, That the Administrator may authorize licensees to prepare and use unlicensed single-fraction vaccines for this purpose.

(c) Test procedure: (1) Rehydrate at least two vials of the vaccine with the liquid product under test according to label recommendations and pool the contents.

(2) Rehydrate at least two vials of the vaccine with the same volume of sterile purified water and pool the contents.

(3) Neutralize to remove other fractions, if necessary.

(4) Hold the two pools of vaccine at room temperature (20 °to 25 °C) for 2 hours. The holding period shall begin when rehydration is completed.

(5) Titrate the virus(es) in each pool of vaccine as provided in the filed Outline of Production or an applicable standard requirement.

(6) Compare respective titers.

(d) If the titer of the vaccine virus(es) rehydrated with the product under test is more than 0.7 log10 below the titer of the vaccine virus(es) rehydrated with sterile purified water, the product is unsatisfactory for use as diluent.

(e) If the product is unsatisfactory in the first test, one retest to rule out faulty techniques may be conducted using four vials of the vaccine for each pool and the acceptability of the product judged by the results of the second test.

(f) Liquid products found to be unsatisfactory for use as diluent by this test are not prohibited from release as separate licensed products if labeled as prescribed in § 112.7(g).

We are amending the veterinary biological product regulations by defining the terms used for reporting the results of tests performed on veterinary biological products. Licensees and permittees of veterinary biological products must conduct these tests and report the results to the Animal and Plant Health Inspection Service so that the Agency can determine if the products are eligible for release. Defining these terms will clarify the circumstances under which the results of a prescribed test can be reported as satisfactory, unsatisfactory, inconclusive, or a No Test. We are also removing several obsolete testing standard requirements from the regulations. These changes will update our regulations and improve communication between regulators and product licensees and permittees with respect to reporting test results.

We are amending the “In vitro tests for serial release” regulations by removing a footnote that refers to one method to calculate the relative antigen content of inactivated veterinary biological products and relative potency calculation software available from Veterinary Services' Center for Veterinary Biologics (CVB). CVB will no longer provide or update the software and the written method for using the software will no longer be used. This action will update the regulations.

This is a list of United States Code sections, Statutes at Large, Public Laws, and Presidential Documents, which provide rulemaking authority for this CFR Part.

We are amending the veterinary biological product regulations by defining the terms used for reporting the results of tests performed on veterinary biological products. Licensees and permittees of veterinary biological products must conduct these tests and report the results to the Animal and Plant Health Inspection Service so that the Agency can determine if the products are eligible for release. Defining these terms will clarify the circumstances under which the results of a prescribed test can be reported as satisfactory, unsatisfactory, inconclusive, or a No Test. We are also removing several obsolete testing standard requirements from the regulations. These changes will update our regulations and improve communication between regulators and product licensees and permittees with respect to reporting test results.

We are amending the “In vitro tests for serial release” regulations by removing a footnote that refers to one method to calculate the relative antigen content of inactivated veterinary biological products and relative potency calculation software available from Veterinary Services' Center for Veterinary Biologics (CVB). CVB will no longer provide or update the software and the written method for using the software will no longer be used. This action will update the regulations.

We will consider all comments that we receive on or before July 29, 2014.

9 CFR Parts 101 and 113

Summary

We are proposing to amend the veterinary biological product regulations by defining the terms used for reporting the results of tests performed on veterinary biological products. Licensees and permittees of veterinary biological products must conduct these tests and report the results to the Animal and Plant Health Inspection Service so that the Agency can determine if the products are eligible for release. Defining these terms would clarify the circumstances under which the results of a prescribed test can be reported as satisfactory, unsatisfactory, inconclusive, or a No Test. We are also proposing to remove several obsolete testing standard requirements from part 113. These changes would update our regulations and improve communication between regulators and product licensees and permittees with respect to reporting test results.